Yeah, he is right. Definitely go with TR tires if you can. With good sealant, the non TR tires will most likely seal up, but sometimes the sidewalls weep fluid.
Also, if you burp a wire bead tire, there is little chance of recovering on the trail unless you have a CO2 cartridge with you. The wire bead pulls off the shoulder and doesn't flex back as well. I found that out too.
Actually, Schwalbe just release their new ADDIX compound tires, so a lot of places are selling the Pacestar compound ones really cheap. I picked up 2 Racing Ralphs for $33 each. They were SnakeSkin carcass and Tubeless-Ready.